fix yaml

Author: mattip

.github/workflows/posix.yml

@@ -59,14 +59,14 @@ jobs:
         fetch-depth: 0
 
     - uses: maxim-lobanov/setup-xcode@v1.6.0
-       if: ${{ matrix.os == 'macos-latest' }}
-       with:
-         xcode-version: '16.0'
+      if: ${{ matrix.os == 'macos-latest' }}
+      with:
+        xcode-version: '16.0'
 
     - uses: maxim-lobanov/setup-xcode@v1.6.0
-       if: ${{ matrix.os == 'macos-14' }}
-       with:
-         xcode-version: '15.4'
+      if: ${{ matrix.os == 'macos-14' }}
+      with:
+        xcode-version: '15.4'
 
     - name: Print some Environment variable
       run: |